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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a02999037c37e1e92382605513688bf9faac9fde47b34eb8469cb63a76290aa3' 
  AND token = 'cp6z9L7b3NknmzZ6E4EfAWx3IYRP+VN9CzL/3AG6/+A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}